Blue Sea Systems Temperature Sensors Models: High Temp Temperature Sensor: 1821-SS Submersible Temperature Sensor: 1820-SS Blue Sea Systems offers temperature sensors designed to provide accurate temperature monitoring for various marine applications, compatible with all Blue Sea Systems devices requiring temperature sensing. Key Features High Temp Sensor (1821-SS): Designed for sensing Raw Water Exhaust temperature without drilling holes Straps onto outside of pipes for accurate temperature readings Multiple mounting options Non-submersible with IP65 rating (protected against jets of water) Wires connect in either order Submersible Sensor (1820-SS): General-purpose temperature sensor for most applications Easy installation with double-sided tape Fully submersible with IP68 rating Wires connect in either order Specifications Comparison Feature High Temp Sensor 1821-SS Submersible Sensor 1820-SS Temperature Range -40°F to 300°F (-40°C to 150°C) -40°F to 175°F (-40°C to 80°C) Wire Length 18 in (45.72 cm) 12 in (30.48 cm) Wire Size 16 AWG 16 AWG Weight 0.20 lb (0.09 kg) 0.04 lb (0.02 kg) IP Rating IP65 (non-submersible) IP68 (fully submersible) Installation Strap-on, multiple mounting options Double-sided tape Compatibility Works with all Blue Sea Systems temperature sensor devices Works with all Blue Sea Systems temperature sensor devices What’s in the Box 1 × Temperature Sensor (model 1821-SS or 1820-SS) Mounting accessories as per model (strap or double-sided tape)